package servlets.module.lesson;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Locale;
import java.util.ResourceBundle;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.owasp.encoder.Encode;
import utils.Hash;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * Insecure Direct Object Lesson <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class DirectObjectLesson extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(DirectObjectLesson.class);
  private static String levelName = "Insecure Direct Object Lesson";
  public static String levelhash =
      "fdb94122d0f032821019c7edf09dc62ea21e25ca619ed9107bcc50e4a8dbc100";
  private static String levelResult = "59e571b1e59441e76e0c85e5b49";

  /**
   * System users are insecurely directed by their user name in a post request parameter. Users can
   * abuse this to retrieve an administrator's information.
   *
   * @param username User name of profile to retrieve
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));

    // Translation Stuff
    Locale locale = new Locale(Validate.validateLanguage(request.getSession()));
    ResourceBundle errors = ResourceBundle.getBundle("i18n.servlets.errors", locale);
    ResourceBundle bundle = ResourceBundle.getBundle("i18n.servlets.lessons.directObject", locale);

    // Attempting to recover username of session that made request
    HttpSession ses = request.getSession(true);
    PrintWriter out = response.getWriter();
    out.print(getServletInfo());
    if (Validate.validateSession(ses)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      log.debug(levelName + " servlet accessed by: " + ses.getAttribute("userName").toString());
      try {
        String userName = request.getParameter("username");
        log.debug("User Submitted - " + userName);
        String ApplicationRoot = getServletContext().getRealPath("");
        log.debug("Servlet root = " + ApplicationRoot);
        String htmlOutput = new String();
        if (userName.equalsIgnoreCase("guest")) {
          log.debug("Guest Profile Found");
          htmlOutput = htmlGuest(bundle);
        } else if (userName.equalsIgnoreCase("admin")) {
          // Get key and add it to the output
          String userKey =
              Hash.generateUserSolution(levelResult, (String) ses.getAttribute("userName"));
          log.debug("Admin Profile Found");
          htmlOutput = htmlAdmin(bundle, userKey);
        } else {
          log.debug("No Profile Found");

          htmlOutput =
              "<h2 class='title'>"
                  + bundle.getString("response.user")
                  + ": "
                  + bundle.getString("response.notFound")
                  + "</h2><p>"
                  + bundle.getString("response.user")
                  + " '"
                  + Encode.forHtml(userName)
                  + "' "
                  + bundle.getString("response.couldNotFind")
                  + ".</p>";
        }
        log.debug("Outputting HTML");
        out.write(htmlOutput);
      } catch (Exception e) {
        out.write(errors.getString("error.funky"));
        log.fatal("Insecure Direct Object Lesson Lesson - " + e.toString());
      }
    } else {
      out.write(errors.getString("error.noSession"));
      log.error(levelName + " servlet accessed with no session");
    }
  }

  private static String htmlGuest(ResourceBundle bundle) {
    return "<h2 class='title'>"
        + bundle.getString("response.user")
        + ": Guest</h2><table><tr><th>"
        + bundle.getString("response.age")
        + ":</th><td>22</td></tr>"
        + "<tr><th>"
        + bundle.getString("response.address")
        + ":</th><td>54 Kevin Street, Dublin</td></tr>"
        + "<tr><th>"
        + bundle.getString("response.email")
        + ":</th><td>guestAccount@securityShepherd.com</td></tr>"
        + "<tr><th>"
        + bundle.getString("response.message")
        + ":</th><td>"
        + bundle.getString("response.noMessage")
        + "</td></tr></table>";
  }

  private static String htmlAdmin(ResourceBundle bundle, String key) {
    return "<h2 class='title'>"
        + bundle.getString("response.user")
        + ": Admin</h2><table><tr><th>"
        + bundle.getString("response.age")
        + ":</th><td>43</td></tr>"
        + "<tr><th>"
        + bundle.getString("response.address")
        + ":</th><td>12 Bolton Street, Dublin</td></tr>"
        + "<tr><th>"
        + bundle.getString("response.email")
        + ":</th><td>administratorAccount@securityShepherd.com</td></tr>"
        + "<tr><th>"
        + bundle.getString("response.message")
        + ":</th>"
        + "<td>"
        + bundle.getString("result.resultKey")
        + ": "
        + key
        + "<a></a></td></tr></table>";
  }
}
